docs: def humid_ratio_from_db_rh(db_temp, rel_humid, b_press=101325):
      """Humidity Ratio (kg water/kg air) at a db_temp (C),
      rel_humid (%) and Pressure b_press (Pa).
  
      Note:
          [1] Vaisala. (2013) Humidity Conversion Formulas:
          Calculation Formulas for Humidity.
          www.vaisala.com/Vaisala%20Documents/Application%20notes/Humidity_Conversion_Formulas_B210973EN-F.pdf
      """
      # Find saturation pressure
      p_ws = saturated_vapor_pressure(db_temp + 273.15)
      # Calculate partial pressure
      decrh = rel_humid * 0.01
      p_w = decrh * p_ws
      # Calculate humidity ratio
      press_differ = b_press - p_w
      constant = p_w * 0.621991
      humidity_ratio = constant / press_differ
      return humidity_ratio